HYDRAULIC SYSTEM
STW34, STW37, STW40, WSM
8-S10
Checking Bi-speed / PTO System Pressure
1. Start the engine and warm up the transmission fluid, and then
stop the engine.
2. Remove the bi-speed system pressure checking port (PT 1/8)
(1) plug (PT 1/8) on the bi-speed valve (2).
3. Install the long connector (code: 07916-60831) to checking port
(1), and then install the threaded joint, cable and pressure
gauge.
4. Start the engine and set the idling speed.
5. Measure the pressure.
6. If the measurement is not within factory specifications, adjust
the pressure reducing valve adjustor (4) on the regulator valve
(5).
Condition
• Engine speed:
Idling speed
• Oil temperature:
40 to 60 °C (104 to 140 °F)
(Reference)
• Turn to clockwise direction → Pressure is increased
• Turn to counterclockwise direction → Pressure is decreased
9Y1211109HYS0009US0
(4) Regulator Valve
Relief Valve Setting Pressure
1. Remove the power steering delivery pipe from hydraulic pump.
2. Assemble the power steering delivery pipe (1) using a adaptor
E (2) instead of original joint.
3. Start the engine. After warming up, set the engine speed at
maximum.
4. Fully turn the steering wheel to the left end to read the relief
pressure. After reading, stop the engine.
5. If the pressure is not within the factory specification, check the
pump delivery line and replace the steering controller assembly.
Condition
• Engine speed:
Maximum
• Oil temperature:
40 to 60 °C (104 to 140 °F)
9Y1211109HYS0010US0
Bi-speed / PTO system
pressure
Factory specification
1.76 to 1.86 MPa
18 to 19 kgf/cm
2
256 to 270 psi
(1) System Pressure Checking Port
(PT 1/8)
(2) Bi-speed Valve
(3) Long Connector
(Code: 07916-60831)
(4) Pressure Reducing Valve Adjustor
(5) Regulator Valve
Power steering relief
valve setting pressure
Factory specification
12.5 to 13.5 MPa
128 to 137 kgf/cm
2
1820 to 1950 psi
(1) Power Steering Delivery Pipe (2) Adaptor E
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